Constraining nucleon effective masses with flow and stopping observables from the SπRIT experiment

SπRIT collaboration

doi:10.1016/j.physletb.2024.138661

Constraining nucleon effective masses with flow and stopping observables from the SπRIT experiment

SπRIT collaboration

Research output: Contribution to journal › Article › peer-review

Abstract

Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow (v₁), elliptic flow (v₂) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at [Formula presented] with the SπRIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, S₀, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, m_s^⁎/m_N, isovector effective mass, m_v^⁎/m_N and the in-medium cross-section enhancement factor η. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the SπRIT data suggest a narrow range of preferred values for m_s^⁎/m_N, m_v^⁎/m_N and η.

Original language	English
Article number	138661
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	853
DOIs	https://doi.org/10.1016/j.physletb.2024.138661
Publication status	Published - 2024 Jun

Bibliographical note

Publisher Copyright:
© 2024 The Author(s)

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2024.138661

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@article{b05f5d135f904bbdba72b5c6cf938e58,

title = "Constraining nucleon effective masses with flow and stopping observables from the SπRIT experiment",

abstract = "Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow (v1), elliptic flow (v2) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at [Formula presented] with the SπRIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, S0, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, ms⁎/mN, isovector effective mass, mv⁎/mN and the in-medium cross-section enhancement factor η. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the SπRIT data suggest a narrow range of preferred values for ms⁎/mN, mv⁎/mN and η.",

author = "{SπRIT collaboration} and Tsang, {C. Y.} and M. Kurata-Nishimura and Tsang, {M. B.} and Lynch, {W. G.} and Zhang, {Y. X.} and J. Barney and J. Estee and G. Jhang and R. Wang and M. Kaneko and Lee, {J. W.} and T. Isobe and T. Murakami and Ahn, {D. S.} and L. Atar and T. Aumann and H. Baba and K. Boretzky and J. Brzychczyk and G. Cerizza and N. Chiga and N. Fukuda and I. Gasparic and B. Hong and A. Horvat and K. Ieki and N. Inabe and Kim, {Y. J.} and T. Kobayashi and Y. Kondo and P. Lasko and Lee, {H. S.} and Y. Leifels and J. {\L}ukasik and J. Manfredi and McIntosh, {A. B.} and P. Morfouace and T. Nakamura and N. Nakatsuka and S. Nishimura and H. Otsu and P. Paw{\l}owski and K. Pelczar and D. Rossi and H. Sakurai and C. Santamaria and H. Sato and H. Scheit and R. Shane and Y. Shimizu",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s)",

year = "2024",

month = jun,

doi = "10.1016/j.physletb.2024.138661",

language = "English",

volume = "853",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Constraining nucleon effective masses with flow and stopping observables from the SπRIT experiment

AU - SπRIT collaboration

AU - Tsang, C. Y.

AU - Kurata-Nishimura, M.

AU - Tsang, M. B.

AU - Lynch, W. G.

AU - Zhang, Y. X.

AU - Barney, J.

AU - Estee, J.

AU - Jhang, G.

AU - Wang, R.

AU - Kaneko, M.

AU - Lee, J. W.

AU - Isobe, T.

AU - Murakami, T.

AU - Ahn, D. S.

AU - Atar, L.

AU - Aumann, T.

AU - Baba, H.

AU - Boretzky, K.

AU - Brzychczyk, J.

AU - Cerizza, G.

AU - Chiga, N.

AU - Fukuda, N.

AU - Gasparic, I.

AU - Hong, B.

AU - Horvat, A.

AU - Ieki, K.

AU - Inabe, N.

AU - Kim, Y. J.

AU - Kobayashi, T.

AU - Kondo, Y.

AU - Lasko, P.

AU - Lee, H. S.

AU - Leifels, Y.

AU - Łukasik, J.

AU - Manfredi, J.

AU - McIntosh, A. B.

AU - Morfouace, P.

AU - Nakamura, T.

AU - Nakatsuka, N.

AU - Nishimura, S.

AU - Otsu, H.

AU - Pawłowski, P.

AU - Pelczar, K.

AU - Rossi, D.

AU - Sakurai, H.

AU - Santamaria, C.

AU - Sato, H.

AU - Scheit, H.

AU - Shane, R.

AU - Shimizu, Y.

PY - 2024/6

Y1 - 2024/6

N2 - Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow (v1), elliptic flow (v2) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at [Formula presented] with the SπRIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, S0, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, ms⁎/mN, isovector effective mass, mv⁎/mN and the in-medium cross-section enhancement factor η. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the SπRIT data suggest a narrow range of preferred values for ms⁎/mN, mv⁎/mN and η.

AB - Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow (v1), elliptic flow (v2) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at [Formula presented] with the SπRIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, S0, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, ms⁎/mN, isovector effective mass, mv⁎/mN and the in-medium cross-section enhancement factor η. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the SπRIT data suggest a narrow range of preferred values for ms⁎/mN, mv⁎/mN and η.

UR - http://www.scopus.com/inward/record.url?scp=85191296621&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2024.138661

DO - 10.1016/j.physletb.2024.138661

M3 - Article

AN - SCOPUS:85191296621

SN - 0370-2693

VL - 853

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 138661

ER -

Constraining nucleon effective masses with flow and stopping observables from the SπRIT experiment

Abstract

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ASJC Scopus subject areas

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